Abstract
The impact of moderate water deficit on the photosynthetic apparatus of three Phaseolus vulgaris L. cultivars, Plovdiv 10 (P10), Dobrudjanski Ran (DR) and Prelom (Prel), was investigated. Water shortage had less impact on leaf hydration, RWC (predawn and midday) and predawn water potential in Prel. RWC and Ψ(p) were more reduced in P10, while there was no osmotic adjustment in any cultivar. Although drought drastically reduced stomatal opening in P10 and DR, reduced A(max) indicated non-stomatal limitations that contributed to the negligible P(n). These limitations were on potential thylakoid electron transport rates of PSI and II, pointing to photosystem functioning as a major limiting step in photosynthesis. This agrees with decreases in actual photochemical efficiency of PSII (F(v)'/F(m)'), quantum yield of photosynthetic non-cyclic electron transport (ϕ(e)) and energy-driven photochemical events (q(P)), although the impact on these parameters would also include down-regulation processes. When compared to DR, Prel retained a higher functional state of the photosynthetic machinery, justifying reduced need for photoprotective mechanisms (non-photochemical quenching, zeaxanthin, lutein, β-carotene) and maintenance of the balance between energy capture and dissipative pigments. The highest increases in fructose, glucose, arabinose and sorbitol in Prel might be related to tolerance to a lower oxidative state. All cultivars had reduced A(max) due to daytime stomatal closure in well-watered conditions. Under moderate drought, Prel had highest tolerance, higher leaf hydration and maintenance of important photochemical use of energy. However, water shortage caused appreciable non-stomatal limitations to photosynthesis linked to regulation/imbalance at the metabolic level (and growth) in all cultivars. This included damage, as reflected in decreased potential photosystem functioning, pointing to higher sensitivity of photosynthesis to drought than is commonly assumed.
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Claims 16
Claim · model-written summary
Water shortage had less impact on leaf hydration, relative water content and predawn water potential in Prel.
- Taxon
- Phaseolus vulgaris L.
Phaseolus vulgarist0 - Material
- Prele0
- Treatment
- Water shortagee0
- Outcome
- leaf hydration, RWC (predawn and midday) and predawn water potentiale0
- Direction
- less impacte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water shortage had less impact on leaf hydration, RWC (predawn and midday) and predawn water potential in Prel”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Relative water content and predawn water potential were more reduced in P10.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Material
- P10e0
- Treatment
- Water shortagee1
- Outcome
- RWC and Ψ(p)e0
- Direction
- more reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RWC and Ψ(p) were more reduced in P10”
t0“Phaseolus vulgaris L.”
e1“Water shortage had less impact on leaf hydration, RWC (predawn and midday) and predawn water potential in Prel”
Claim · model-written summary
No cultivar showed osmotic adjustment under water deficit.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Material
- any cultivare0
- Outcome
- no osmotic adjustmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no osmotic adjustment in any cultivar”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Drought drastically reduced stomatal opening in P10 and DR.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Material
- P10 and DRe0
- Treatment
- droughte0
- Outcome
- stomatal openinge0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought drastically reduced stomatal opening in P10 and DR”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Drought reduced maximum assimilation, indicating nonstomatal limitations and negligible net photosynthesis.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Treatment
- droughte1
- Outcome
- A(max)e0
- Direction
- reducede0
- Qualifier
- non-stomatal limitationse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced A(max) indicated non-stomatal limitations that contributed to the negligible P(n)”
e1“Although drought drastically reduced stomatal opening in P10 and DR”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Potential thylakoid electron transport rates of PSI and II were limited.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Outcome
- potential thylakoid electron transport rates of PSI and IIe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These limitations were on potential thylakoid electron transport rates of PSI and II”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Actual PSII efficiency, photosynthetic electron transport yield and energy driven photochemical events decreased.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Outcome
- actual photochemical efficiency of PSII (F(v)'/F(m)'), quantum yield of photosynthetic non-cyclic electron transport (ϕ(e)) and energy-driven photochemical events (q(P))e0
- Direction
- decreasese0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreases in actual photochemical efficiency of PSII (F(v)'/F(m)'), quantum yield of photosynthetic non-cyclic electron transport (ϕ(e)) and energy-driven photochemical events (q(P))”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Prel retained higher photosynthetic machinery function than DR.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Material
- Prele0
- Outcome
- functional state of the photosynthetic machinerye0
- Direction
- highere0
- Comparator
- DRe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When compared to DR, Prel retained a higher functional state of the photosynthetic machinery”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Prel had reduced need for photoprotective mechanisms compared with DR.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Material
- Prele0
- Outcome
- need for photoprotective mechanismse0
- Direction
- reducede0
- Comparator
- DRe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When compared to DR, Prel retained a higher functional state of the photosynthetic machinery, justifying reduced need for photoprotective mechanisms (non-photochemical quenching, zeaxanthin, lutein, β-carotene)”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Prel maintained a balance between energy capture and dissipative pigments.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Material
- Prele1
- Outcome
- balance between energy capture and dissipative pigmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maintenance of the balance between energy capture and dissipative pigments”
e1“Prel retained a higher functional state of the photosynthetic machinery”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Prel showed the highest increases in fructose, glucose, arabinose and sorbitol.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Material
- Prele0
- Outcome
- fructose, glucose, arabinose and sorbitole0
- Direction
- highest increasese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest increases in fructose, glucose, arabinose and sorbitol in Prel”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
The metabolite increases in Prel may relate to tolerance of a lower oxidative state.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Material
- Prele0
- Compound
- fructose, glucose, arabinose and sorbitole0
- Outcome
- tolerance to a lower oxidative statee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest increases in fructose, glucose, arabinose and sorbitol in Prel might be related to tolerance to a lower oxidative state”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Daytime stomatal closure reduced maximum assimilation in all cultivars even when well watered.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Material
- All cultivarse0
- Outcome
- A(max)e0
- Direction
- reducede0
- Qualifier
- daytime stomatal closure in well-watered conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All cultivars had reduced A(max) due to daytime stomatal closure in well-watered conditions”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Under moderate drought, Prel showed the highest tolerance, greater leaf hydration and maintained photochemical energy use.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Material
- Prele0
- Outcome
- tolerance, higher leaf hydration and maintenance of important photochemical use of energye0
- Direction
- higheste0
- Qualifier
- moderate droughte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under moderate drought, Prel had highest tolerance, higher leaf hydration and maintenance of important photochemical use of energy”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Water shortage caused nonstomatal photosynthetic limitations in all cultivars.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Treatment
- water shortagee0
- Outcome
- non-stomatal limitations to photosynthesise0
- Qualifier
- regulation/imbalance at the metabolic level (and growth)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water shortage caused appreciable non-stomatal limitations to photosynthesis linked to regulation/imbalance at the metabolic level (and growth) in all cultivars”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Reduced potential photosystem function indicated damage under water shortage.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Outcome
- potential photosystem functioninge0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This included damage, as reflected in decreased potential photosystem functioning”
t0“Phaseolus vulgaris L.”
The same questions in other papers
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- no effect
- negative
- negative
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12 papers in the same direction as this paper · 2 in the opposite direction
- positive
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See all 15 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.